Toshiba RAV-SM304MUT-E Service Manual page 58

[P19 error]
Is operation of 4-way valve normal?
(Check the pipe temp., etc.
during cooling/heating operation.
Check temperature sensors.
TE sensor
TS sensor
Indoor TC sensor
Defective → Correct, replace
Operation check direction of the outdoor P.C. board (In case of self-preservation valve)
1) Set the Dip switch SW804 as same as the following table and push SW801 for approx. 1 second. It enables
you to check the exchange operation to cooling cycle or heating cycle.
• Only for approx. 10 seconds, the power is turned on.
• As the heat value of part (coil: resistance R700) is large, when checking the operation continuously, wait 1
minute or more until the next check. (There is no problem if a coil is not connected.)
2) After check, turn off all the Dip switches SW804.
Exchange to cooling cycle
SW804 SW801
Check by tester
Analog tester: Good article if over DC180V
Digital tester: Although in some cases, the value varied and indicated. If the maximum value is DC180V or
more, it is good article.
AMP Air Conditioning
NO
resistance value of 4-way valve coil ?
YES
Check outdoor P.C. board operation.
CN701
1
Push
4
DC180V or more
Are 1.3 to 1.6kΩ applied to
YES
(See the following description.)
OK
Check 4-way valve.
Defective → Replace
Exchange to heating cycle
SW804 SW801
Push
– 58 –
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NO
Replace 4-way valve coil.
Defective
Check outdoor P.C. board.
Defective → Replace
CN701
1
4
DC180V or more